232 U. S. NATIONAL MUSEUM BULLETIN 216 part 3 



Male: Black. Facial orbit, lower part of frontal orbit, and short 

 mark at top of eye narrowly whitish; mandible largely white; palpi 

 brown; front of scape fulvous; tegula sometimes with a small white 

 spot at base; first trochanters fuscous, fulvous below; front and middle 

 legs beyond first trochanters, fulvous; hind second trochanter and 

 femur fulvous; hind tibia and segments 1 and 5 of hind tarsus fulvous 

 brown; segments 2-4 of hind tarsus yello\vish, the second segment 

 fulvous basally; wings moderately infuscate; abdomen ferruginous. 



Female: Black. Front and hind orbits narrowly white; legs dark 

 brown or fuscoferruginous, the front and middle tibiae, front side of 

 front femur, and segments 2-4 of hind tarsus a little paler; hind femur 

 and abdomen ferruginous; wings moderately infuscate, in a specimen 

 from Texas wealdy infuscate. 



Specimens: 9, Yavapai Point, Grand Canyon, Ariz., June 18, 1943, 

 L. Scheilbach (Washington), d', Carmel, Calif., Apr. 18, 1928, 

 L. S. Slevin (San Francisco). 9, Basin, Big Bend National Park, Tex., 

 May 3, 1953, Howden and Becker (Ottawa). 



This species ranges from central California to the Big Bend part of 

 Texas, and southward into Mexico. 



24. Trachysphyrvis ruralis (Pratt) 



Cryptus ruralis Pratt, 1945, Amer. Midi. Nat., vol. 34, p. 637; ?. Type: ?, 

 Virginia Dale, Colo. (Washington). 



Male: Front wing 5.7 to 7.2 mm. long. Structure similar to that 

 of T. persimilis but build a little more slender, pronotum and frons 

 with a slightly stronger tendency toward wrinkling, and second 

 recurrent vein a little less strongly sinuate. 



Black. Face, clypeus, front part of cheek, frontal orbit, vertical 

 orbit, narrow stripe on hind orbit, mandible, front of scape, tegula, 

 subtegular ridge, usually a submarginal stripe on upper edge of 

 pronotum, front and lower end of front coxa, spot on under side of 

 middle coxa, and under side of front and middle first trochanters, 

 white; second trochanters fulvous or fulvous and fuscous, the front 

 and middle ones whitish below; legs beyond trochanters fulvous, the 

 fifth tarsal segments fuscous, extreme apex of hind tibia infuscate, 

 and hind tarsus fulvous brown to brown ; wings weakly tinged with 

 brown; abdomen ferruginous, the clasper blackish, the subgenital 

 plate and usually base of first segment infuscate. 



The male described above was considered by Pratt to be the male 

 of his "Cryptus associatus^' (1945, Amer. Midi. Nat., vol. 34, p. 

 633). Pratt's females of "associatus" are specimens of persimilis. 

 We assign the males of Pratt's "associatus" to the present species, 

 known previously only in the female. This correlation of sexes,, 

 however, is tentative. 



